大61-21井溢流的压井处理及其处理方法浅析

Well Killing for Overflow of Da 61-21 Well and Discussion on the Treatment Method

通过对大61-21井马五5典型小储量气井又漏又涌溢流的处理,总结出了小储量气井在井漏后,随着漏入钻井液量的增多,而表现出地层压力不断升高和循环正常后停泵又会出现井口溢流现象的两大特征。井漏、溢流、提高密度、井漏的恶性循环是处理这类溢流的井控技术难点。当出现又漏又涌的溢流时,及时诊断是否属于小储量气井对选择处理方法很重要。针对小储量气井出现又漏又涌情况,只要满足安全条件,采取平推压井是经济有效的处理方法。大61-21井采用循环加重和平推2种方法结合处理小储量气井溢流的经验与教训,对同类井具有一定借鉴意义。

By the treatment of lost circulation and drilling fluid overflow in 61-21 well in Mawu formation,a typical gas well with small reserves and with the increasing of drilling fluid lost,two characteristics of higher formation pressure and overflow at wellhead while stopping pump were summed up.It is difficult to deal with the vicious circle of lost circulation,overflow,increase density and lost circulation again.Under the conditions of lost circulation and overflow,it is important to judge rapidly if the problem is in a gas well with small reserves;if it is,flat push killing well is an economical and effective method.The experiences and lessons from the combination of circulation weight and flat push killing well methods in dealing with overflow of gas well with small reserves could be the reference to the similar wells.